Bluemindo

Ergonomic and modern music player designed for audiophiles

Bluemindo's user interface consists of a main view of all your digitized
album discs, which is searchable and filterable. The playback mode is
gapless and support ReplayGain (it can also automatically choose to switch
between Album and Track modes, depending on the kind of music that's being
played). Last but not least, it brings playlist (automatic and user-made),
MPRIS/MediaPlayer2 support and lyrics/artwork downloading.

It's a free software distributed under GPLv3 terms and written in Python 3.x
using GSTreamer 1.x and GTK 3.x.